title: Active structuring of colloidal armour on liquid drops.
abstract: Adsorption and assembly of colloidal particles at the surface of liquid droplets are at the base of particle-stabilized emulsions and templating. Here we report that electrohydrodynamic and electro-rheological effects in leaky-dielectric liquid drops can be used to structure and dynamically control colloidal particle assemblies at drop surfaces, including electric-field-assisted convective assembly of jammed colloidal 'ribbons', electro-rheological colloidal chains confined to a two-dimensional surface and spinning colloidal domains on that surface. In addition, we demonstrate the size control of 'pupil'-like openings in colloidal shells. We anticipate that electric field manipulation of colloids in leaky dielectrics can lead to new routes of colloidosome assembly and design for 'smart armoured' droplets.
authors.affiliation: Department of Physics, Norwegian University of Science and Technology, Hoegskoleringen 5, N-7491 Trondheim, Norway.
authors.forename: Paul
authors.initials: P
authors.lastname: Dommersnes
authors.forename: Zbigniew
authors.initials: Z
authors.lastname: Rozynek
authors.forename: Alexander
authors.initials: A
authors.lastname: Mikkelsen
authors.forename: Rene
authors.initials: R
authors.lastname: Castberg
authors.forename: Knut
authors.initials: K
authors.lastname: Kjerstad
authors.forename: Kjetil
authors.initials: K
authors.lastname: Hersvik
authors.forename: Jon
authors.initials: J
authors.lastname: Otto Fossum